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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8962aaa8269784e0316062a692540de197e7e35516fdcf21ee239790d8a78034' 
  AND token = 'mCWm7M5bAPDo3g/Vs+HIhXtgfyhfBUZODLi2BR6xd1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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