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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18fb212a44a574b4e9bd3c6dba449ca900b8dce87db7f3bb566b97920b10c76' 
  AND token = 'K7OhagI1n7GxEE0qf0yrakPx8I4VuiI14vSwZt1ev6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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