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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a778cf96cfc2a12ae656597a299e8964965cc1a11171c789c4458b00b98c630' 
  AND token = '+eZ6BScG+rzIyzXGU0sTVpwe80JparIhe2QR1bXUxYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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