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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a84c73310038d7c0711d02e36e055c01c55937ef86a8b84f5a67d11a6498c3' 
  AND token = '7SbEZhlme563ffzN3t1l0XJen9KdX6I8AdMygZ3KiAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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