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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09cbc6c5bcd6c936b4dc02fe7e98f32abca3da0fdbe27265751b1b1a9e0c9a6' 
  AND token = '6kmAk5L4i2j5O4H7Kky5rUPl8xK7ftwMQC4AGmF3gu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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