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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '130f9f18b696c4380f157871952a2b63e343cbeac0283d03e1ddd83153b95089' 
  AND token = 'SqKEl/6jTZmex195cJ+2/7i69akuvTVHtKS/KWO2FkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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