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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6aba5a145f34a67cccae597c9c90a6898c6255e1bcfa0defff1b86ac8fddcd' 
  AND token = '7AVYMwXdaLXFECwSz1YBbJ/TPAGnWrik/Vw4aWMmvpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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