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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33015f20c2035f1f26cff24f0d62ef4eb96533af3ffb866b7cbd53f56692813' 
  AND token = 'hxSGWr36lVI5BMzeLWeOdvA8rQ/YvSstXb3uoYVAT28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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