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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c73f6fce6e55fcb8343de8175bc554f96f435853645d43056dcc1902ab403af' 
  AND token = 'w2jeotBwIOPVhpXVm3AsncTofQRNQBa53/53LtyT5k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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