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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01dae8c3c6813046423a2a3dea7fc05eaa9a115359913295552d2ecd359fa683' 
  AND token = 'cVwk1vsDVBOONoj0O3V0J4HeMSSimaBx8+yPUmvdzXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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