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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43907b860cb626f17460e8d737f8dae62c8e0b587971a984ea23f968dfe8b6d2' 
  AND token = 'mztnNqbNIl0Tk/dK0ItgqXZ/TfDhAU1hAlUj+p+dhJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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