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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb7100b8258334260af85ce9498dd343a9849be123832d0d33c0070e954fd2b7' 
  AND token = 'BrM81+1KTbxbsTXs/hC845XoHG5DP3rNXRkq0IJKX8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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