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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3412c6c8619a6a045a20092bdfb2bd7877ab74a357fb502271920432c9b3e8' 
  AND token = 'gDznoOeLl4HjV7/NV9eno61rddsrEeaZqjNgYYDrGPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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