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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae7600b028323fe60fce2fc202dc0b210b854407d49b08aed4e92488fe49354' 
  AND token = 'YsxViPdqNkE1DpeTPlHrCZIC4BHorNpL4iuAg23DUnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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