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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f070b925b459634b710f840d06dccf8358d6d94edbb7013912f592607b41110b' 
  AND token = 'MN24rz0GqjUMekUu0xpH5uvCOA65lJejBGjw0a6lgQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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