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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e93a9dc3a94ced3fad53c9f8389c940c815c7bd42f4b4e69040c857e69e42c' 
  AND token = 'pN/UMkrrV7LuBdMoVzdpVsp6BKI/iFoXd94uM5PNO4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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