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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc4ef116cd26c656d23318965c9d342fdfbe92a6707f7ff5dc6faee36b1a83b' 
  AND token = 'eY69QBIWbgtqnLkYQTlOvAhAlWoQ+QB4g3g+xhuigds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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