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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa53d2adf3f6bfb1361ddc1f45aaff2f8d66478716760a8a311f126217a7049d' 
  AND token = '3wKdIFx6LpMpM4U28ICnjsTqz0PrszkIm1ICN9Mwra0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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