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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edad0c679356fb3601cc068e0c64a72a4c10a95c409f41bfcaa66414b089795f' 
  AND token = 'Q3NI6xuxnqmKgyyobb+2+99d1g3nuIOFcN9NgF7Kstc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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