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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8fa278d96124808d358b76cbb2e23339f116fc969d6b97a315d5c7686615033' 
  AND token = '13jx3QQitngYjARVl7z3qqhIR63nhNmZmPerQ8Z6XmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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