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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b75030173cfcbc0729756b4f61d2a87c2d36f9b8dfd8812841321c58d01a98d' 
  AND token = '6wJA5WxhCz/fm70BQMOhZStsF8WhBJznT6CWygM9RMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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