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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54087ab28d0023e592e7cd602cd5d5ae32dc5fb9684da3c68b20c7254f143cef' 
  AND token = '6UmdxHMCC3DNJsILmcdI0M6ldKgolsKsYAvAjNgGArM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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