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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b01105e2961ce3b2ae3dffdb343095d1eb4455b24e1495c8fcbd39a9f5958d' 
  AND token = 'rVwyzTYR81bfiWrkT1eVeTWfwWu06edT3eKOwcCVWYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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