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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32b619cb87bca43f0dba9f88fd0edcfc281ae75b4fe480b6cda91096ded46bc' 
  AND token = 'XWzwcMYR0W93q3ahPEeH3vPEPMAbeqzs5X2fSTGgmy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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