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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e5c3adeb0904c1ce1cdc0b6d783c60722c121e6dda694e7abd496b5aef6137' 
  AND token = 'LM9vDFgFkZ8RZYA9W6TG+EuV17JJhcIbsvhtG8DAS4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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