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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939d55de219dbdeb0abdf28e877ccd299f0deb8e29942d633821c1f2ff7485a7' 
  AND token = 'ishyp2eJQnGoD/EFXd8Uk8VB9XAjAS/wL44ttoCGakc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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