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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45cbd1d4948c8e81528b5061ca56cd1628c7a4eb470baf639d67a59570856ea2' 
  AND token = 'Yc0bB9U8tZgD9qc4kMTtEgqywhxCZ9D0Lvk65j0WC3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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