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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb9c29eb3925cd27fd57efccb93b6eb9db71eab8da9023f2d3bb1a7b7e30008' 
  AND token = 'mjwHN/aTKYE5nup/I4nOzWSKhtDRP5CES9nwoMDSyvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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