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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7e8447da7458100b82d08ca3c5d78b101b43244a057aaf3f08e7bf71cb895f' 
  AND token = 'p6JfhDQnQ446cVVpTU5bG5nNFtIkiCXOQmSa3JE16AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}