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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be6b15bfe4788f24c16bf83c55d05b6c7c4ac6d75d398f9d63f08a7c8d1574f' 
  AND token = 'imh5X3IJrdcR9pUku+LiBhJF+okcorNUXEcOQmeAqM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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