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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137894960ed3901cce986955cbcf271136c4ad79c596d0958178e9f384dbe08f' 
  AND token = 'Yt0zJ08vFrQIYFr8RY3Tkbt1Ri4YSQKPjF9DKkvav4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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