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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d788a131c9858962f5d6cd47d6f65a319ee66808032597653f83f56faac8f1' 
  AND token = 'NrUJsR21BgwN+nHzqfWLi5dpf6zd1TsijlGgN4hvhac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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