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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02579b2fddcc3a88ca724d79463b26c8fbb63c4cfaed9d1df937021ffb05940b' 
  AND token = 'sbfJ7LQZiEsk0x0AAch9/6hvI/1LgdmCcrnHQUcRq94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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