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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba730bbf85487069dd590108ae2c6bbabc34af007baae1fda39503040f83ea2a' 
  AND token = 'QwXd4ORm9AEGWIHC3KDtzL2hGegUrHD5J4qbUfq24uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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