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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae3d4bca89f540cdbfe861af6dd70ebe6ab6b7661483ab9b88adcf2fc5c559c' 
  AND token = 'FLscj1TAXRwusaU53mmm5FaAgVzJcwP3OWgBz3OeJS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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