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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557c84e70b58c6a922e00ff1bbadeb53b67c9c42552b9455870deef105c73d28' 
  AND token = '3puOaGn8Piw4X96mgh3mmCkWXdgBiPZ71Pjvi8XgS2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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