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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69eb72507c1ca87c5969956b1854014e06e30cd2c1b2db0abe44548537e31b92' 
  AND token = 'k5WTC0JipTfvz7Ijpa0TJELrkHINSIO5DRsl53yEH5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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