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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9798caee2fcbebec9533cd0263de4ff02c080e1256cc64e95febda18730c616' 
  AND token = 'QSHMkTIEUXtZp/U2FdAWIwNl2fCx1npXACc0gHFoRSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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