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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d93c444cc8e37ca1bb60f5a18a7dc6834a3836234beeec10aa3b84c6c7f52fd' 
  AND token = 'EqQeju7IH2wkByw+Hqf/smPmlfpxTfhl/QnUiIi7YmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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