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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36075d3f9720182d508dcd4796b0be04e3fdfd73df96d0ba12226b77d36afabc' 
  AND token = 'ZlgAPZ3xilmq/PTxk46sQUBMyDbq2gGd0aACmKZPk0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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