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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '505885da4237a9a886241822c53f13f38e2609c11f4b1d076aa75dcbabbb4c3c' 
  AND token = 'IRvxOZ5IMqsP8qggeeBUcDdckWDkq/2j382lbTfva0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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