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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '122bb9ae52d0ec5dde4289b13716d47b968caf2e27960287315db0c0fa42c368' 
  AND token = '1xFhuJCYIyfLx9mjzYk5Lq+0lA45fLdD4J5m4nHQJN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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