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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12bb273255d779d84492e86c28aa8d791f5a28042f2641e220c77acfbb4e8d03' 
  AND token = 'X8pPQbzYLq/1ONQHnui9Zm3zndDOL40hZ7Kl6NeGIMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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