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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0773b5a37c5d2f2af38e2c673c3e05ed5c45c2a43972ce5371e1a86ed772476c' 
  AND token = 'jJMmCaCLfU4rDRXdd1JZZT+KeltcoED5HKxOWqFuCEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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