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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df89e053470a03781cf28673617c14b0f0ac66c7de3aaca1cab6cd86782a4a5' 
  AND token = '8Qezck8LtfIc+UmES8sMWidKPn8xmVO4SMSm8bKdr9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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