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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0805bb49e50c96ec00ab82fb55412e4222efa1997c4f473e723b74a55b7b696f' 
  AND token = 'ZhtEdeM53xlDTobiEwl93IXao+4Ovsc9rMmAxS1etIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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