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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3c59530bac78089e79a2faf580822be8023038554d94f5c403b6043fbc8b3e' 
  AND token = 'Yy3KDtzaUF/ensNL199e1FtaOmfXR6n8HDpBKzTAX44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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