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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5de12ea1dcbd7a435fdcbf505a1f124f23665af6ff01fdb233f35c825e7c7ebb' 
  AND token = 'TAheQXYgCuG3zVdRyUJa9poXy0uZRC4vpZKU3Z58LUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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