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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e69855f9f07e1178597f2206404c26bd2e3580517bcfb0ae1190e2c6d12a74' 
  AND token = '6ekGCYEnLqtakhMaN6ckpa4RH8xrJkL51dsdYuvfRvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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