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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb903bab9df3802b991f4da2372b2a4511678baab0b075cac63d93ba869f44e2' 
  AND token = '3Z63twr7/E1gqVPdPdJwbnuJocRk9dczeE8X8HGZgl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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