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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93963c0d4c8c78391c95030788566ab5701b1687060b5c0c5d0cc32e29c6416' 
  AND token = 'o1AgqyLxnOa1XbZLQF5JjhBPZIFVSOSUm7N3y/Xl6k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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