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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882bbd0f038432cb0a7fad3ec6af1f72d681171756054b52c1da77a4b0c1605e' 
  AND token = '/OM15jKQakRmW+35ZDFe5zCewnwgDJbM7+TiJ7zBxXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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