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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9f3df65ce023de7eae8464407c2e67f4e5ee8580b108520e5b2e49e817bca0' 
  AND token = 'yOO0Q5kkyHMW8wopZQ1TSKAy2RUDBhDjmPGXYXP16QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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