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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f58c076a1c1894b6f0c64facb2ffc738d5941f92dfe3ed5f96a6ce0c821261' 
  AND token = 'sw38oqoyATr6hMsg38xe+jqB0k3eu7fUF+PO6HNyeWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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