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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7ae16037cb3e350acaeb35b0c9188a0611788378e65106e21ef20a2f5e280a' 
  AND token = '9QPZGDLE7TD5a8uzzepp55Xcsemo6JGv4WxJU5MLB5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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