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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d191c50b359b776ae2f99e0997ab66a2b3686218f93539c76f223c1f9b06ad7' 
  AND token = 'WCzcMv099Th8qXKkbCvOVhQhlbIQk88/0hRNEHzb+QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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