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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '665a40effb6e504e09cdf75fdb37c4c5009db012c0643f161cfd6ec231ef2ea8' 
  AND token = 'f3x8J88BflUmn9bkYgfS8HeG5+JoslScSX+mnQeoEVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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