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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ce97cb3e2880dc6ae8e5ff4cdaa93be9c753c03c3771b4e2b4c485d841e8db' 
  AND token = 'guictJaJ6PdEJ6XckbHllKOyZl9OZ1J0onaWHwzJbRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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