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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c59e8ec8392bd5841c02cb8b7b22b287e691bb700264b47618d2968acf9c19c' 
  AND token = 'ex82SoiprxjF8JiQrGkBrKe8cn86gW829dLSia6WRIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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