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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdcc73038659379479bb1b7060a61c4257f3051eb0dbd271e5950a604c0aab41' 
  AND token = 'Rf0MFKmUxhL72/q7JzRAOZx5xKmTGy/Uqb6GW9vJVNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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