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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a5911563fe7ae0a020564455a962f5675b4ad25e03e9659ca6cbcd52e8645b' 
  AND token = 'J3BMPt8qto1u+Z9p1OWNFBVpJD2x4tiUshN5pUYHOGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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