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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c602300d847c64541c475195fd349d7d355a2cd11f6a3efb2432fe24606866ee' 
  AND token = 'afJspyjvuPmrx8j9e7PAPlN/Y/Xg/reyTAEKQkH1SUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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