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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace8afbc3d70879b19ed529507be707679f11510e71d22e8af89cc3b14846dae' 
  AND token = 'Y4aHFv3NW71fA9fQCBwHbsV7/AWKf+H7E4rKGY+T83A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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