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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b72834c5b35a774583e514c411d4076f7410d69fb7760c31beb817ee1e10bf' 
  AND token = '2PLnc1I8ztW2Mrljf8Is6Y+gaPTe8uaT22z4EtF4Asc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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