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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd094f8c12f49c6a660d8e50412c570dde036552f7130beea534e3400f72cbaf7' 
  AND token = 'cMKAxUdAhdo53FM2NaTvInLU+ii5DLm2tEL55+htaX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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