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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad531faa786b5dad5076dc1a179808ca228546aec7c6b6dad04023af7f0058fd' 
  AND token = 'bZbo4TJifKro5MWbEAeldXcdyvO36Am+rr/NNy/ej10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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